``` Before: After: ┌─────────────┐ ┌─────────────┐ │ PHP │ │ New TS │ │ Monolith │ │ Service │ └─────────────┘ └─────────────┘ ↑ ↑ │ ┌─────────────┐ │ ├────►│ Facade │◄─────┤ │ │ (Gateway) │ │ │ └─────────────┘ │ │ ↑ │ │ │ │ └────────────┴────────────┘ ```
Scanned 9/7/2026
Install to Claude Code
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# Legacy Code Migration
## Strangler Pattern
```
Before: After:
┌─────────────┐ ┌─────────────┐
│ PHP │ │ New TS │
│ Monolith │ │ Service │
└─────────────┘ └─────────────┘
↑ ↑
│ ┌─────────────┐ │
├────►│ Facade │◄─────┤
│ │ (Gateway) │ │
│ └─────────────┘ │
│ ↑ │
│ │ │
└────────────┴────────────┘
```
## Incremental Extraction
```typescript
// New service imports from legacy via API
// Once feature is migrated, point to new service
// Phase 1: API Gateway routes to PHP
router.get('/users', proxyToLegacy)
// Phase 2: Extract to new service
router.get('/users', userController.findAll)
// Phase 3: Remove legacy dependency
// DELETE /users from PHP
```
## Risk Mapping
| Feature | Complexity | Risk | Migration Order |
|---------|------------|------|-----------------|
| Auth | High | Critical | 1st |
| User Profile | Medium | Medium | 2nd |
| Dashboard | Low | Low | 3rd |
| Legacy Reports | High | Low | Last |
## Checklist
- [ ] Audit legacy codebase
- [ ] Map dependencies
- [ ] Identify bounded contexts
- [ ] Implement strangler facade
- [ ] Extract one feature at a time
- [ ] Run both systems in parallel
- [ ] Cut over gradually
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